NAWQA assessments focus on chemical compounds that have well-established
methods of investigation. It is not financially or technically feasible
to assess all the contaminants in our Nations waters. In general,
the NAWQA Program investigates those pesticides, nutrients, volatile
organic
compounds, and metals that have been or are currently used commonly in
agricultural and urban areas across the Nation. Parameter codes are provided,
which can be used to retrieve data from the NAWQA
datawarehouse or the
USGS NWISWeb